Minitab Notes for Activity 3
The only part of this that really needs to be done with Minitab are
questions 5 and 6. However, if you want to take the time to enter all the
information into Minitab, it will can create the marginal distributions for
you. If you choose to use Minitab for just parts 5 and 6, then enter only
the number of rolls into the worksheet.
Creating the Worksheet
You will be entering your own information for this activity.
- Label four empty columns as "first roll", "initial
result", "final result", "rolls". You're free to
call them something else, but you'll need to adjust the instructions
accordingly. Note that you may only need to enter the number of rolls if
you're doing the marginal distributions by hand.
- Enter the data into the worksheet.
- Optional - not recommended if you get the project done in one sitting.
- Go File / Save Project As
- Move through the filesystem My Documents
- Type a name that is you'll remember
- Click OK
From now on, when you need to work with the project, open the the file
you saved.
Creating Marginal Distributions (Questions 2, 3, and 4)
Although a number, the first roll is actually a categorical variable as
it doesn't make any sense to compare a roll of 4 with a roll of 9. The
results are also categorical variables.
- Choose Stat / Tables / Tally Individual Variables
- Select the "first roll", "initial result", and
"final result" variables.
- Check the box beside Percents so that both Counts and Percents are
displayed.
- Click OK
Summarizing the Data (Question 5)
- Choose Stat / Basic Statistics / Display Descriptive Statistics
- Double click on the variable "rolls"
- Click on Statistics and check the boxes you need: sum, mean, median,
variance, and standard deviation
- Click OK
Histogram (Question 6)
- Choose Graph / Histogram / With Fit
- Select "rolls" for the graph variable
- Click OK
Describe the shape of the distribution. Use words like unimodal, bimodal,
uniform, symmetric, skewed, triangular, bell-shaped, etc., as
appropriate